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Group 1 Elements

16. The order...

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16. The order of stability of metal oxides is Cr2O3 MgO Al2O3 Fe2O3

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Q. The order of stability of metal oxides is

Q. Classify the following oxides into acidic, basic and amphoteric.

C a O

M g O

C O_{2}

S O_{3}

N a_{2} O

Z n O

A l_{2} O_{3}

F e_{2} O_{3}

Classify the following oxides into three types and name the types.

CaO, MgO, CO₂ , SO₃, Na₂O, ZnO, Al₂O₃ , Fe₂O₃

10 g

A l

is used for reduction in each of the following alumino thermic reactions, which reaction would generate more heat and by how much ?
a.

2 A l + C r_{2} O_{3} \to A l_{2} O_{3} + 2 C r

2 A l + F e_{2} O_{3} \to A l_{2} O_{3} + 2 F e

Standard heat of formation of

A l_{2} O_{3}

C r_{2} O_{3}

F e_{2} O_{3}

- 1676 k J

- 1141 k J

- 822.2 k J

, respectively.

C r_{2} O_{3}

F e_{2} O_{3}

A l_{2} O_{3}

are isomorphous but

N a N O_{3}

K N O_{3}

are not isomorphous.

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